为了抑制窄线宽脉冲光纤放大器中受激布里渊散射效应, 使用多谱线技术对单频种子源的线宽进行了拓展, 进行了基于三谱线的主振荡功率放大高峰值功率脉冲全光纤激光器实验验证。结果表明, 经过两级预放、一级功放, 获得激光输出的最大平均功率为303W, 脉宽为2.8ns, 重复频率为3.1MHz, 对应的峰值功率为35kW, 在最高功率输出情况下, 激光器的光束质量小于1.3; 三谱线结构对受激布里渊散射有着明显的抑制作用。该研究为高峰值功率的脉冲光纤激光器放大技术提供了参考。

In order to suppress the stimulated Brillouin scattering effect in narrow linewidth pulse fiber amplifiers, the linewidth of single-frequency seed source was expanded by using multi-spectral line technology. The experimental verification of high peak power pulse all-fiber laser based on three-line master oscillator power amplifier was carried out. The results show that, after two-stage preamplifier and one-stage power amplifier, the maximum average power of laser output is 303W, pulse width is 2.8ns, repetition rate is 3.1MHz, and the corresponding peak power is 35kW. At the highest power output, the beam quality of the laser is less than 1.3. The structure of three spectral lines has obvious inhibition effect on stimulated Brillouin scattering. This study provides a reference for the amplification technology of high peak power pulsed fiber lasers.